There's undeniable hairloss - It doesn't look noticeable to some because his hairline is still quite low but the density of his entire front third of his scalp is diffusing pretty quickly. I suspect he's already had one FUE (when he shaved his hair a while back). Now he's losing the non transplanted hairs and shedding which explains the thin fragile weightless hair but somewhat unharmed shape of his hairline. I think we'll see a resurgence once he gets a 2nd hair transplant (or 1st if he hasn't had one). If Machine Gun Kelly can come back from the hair cemetery then Bieber can. If you watch his Yummy and 10000 hours videos (music video, so his hair is going to look its best) it's pretty obvious that all his hair is pushed in a certain way to cover up the thinning.